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Loans and Leases - Performance of Loans Modified in Last 12 Months (Details) $ in Millions	Mar. 31, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 47
Current Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	44
Loans 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3
Mortgage Loans: | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	44
Mortgage Loans: | Commercial real estate | Current Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	44
Mortgage Loans: | Commercial real estate | Loans 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Mortgage Loans: | Commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Mortgage Loans: | One-to-four family first mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3
Mortgage Loans: | One-to-four family first mortgage | Current Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Mortgage Loans: | One-to-four family first mortgage | Loans 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Mortgage Loans: | One-to-four family first mortgage | 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 3

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